I would think one of the best for hp, it usually gets you better mileage too, is a complete free flowing exhaust system, full length headers and all the rest. Gains should be in the 15-30 hp range and it will sound better too. Of course there are enough aftermarket parts for the BB chevy to fill a barn, so the sky is the limit if you have the cash.
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What shape is that 454 in?How many miles on your rig?What state of tune is it in?How much is affordable?Are you able to do all the work yourself, short of machine shop stuff?Last, but not least, is the truck your dayly driver or just your fun vehicle eg: 4 wheeler, hunting fishing rig etc.

(same guy my other account got messed up)yeah i had a "Y" straight pipe and it pumped out alot more but i couldnt take how loud it was anymore so i put a flowmaster 40 series and a high flow cat.

yeah its a 454 cubic inchit has around 165k milesits it completely stocki can do some of the work myself, but thats what i mean by not break the bank, you know just something that me and the boys could do on a saturdayits a daily driver

Don't forget KnN low restriction air filter or better yet a fresh air package you can fab with 4" dryer hose and parts from your local hardware store,,, almost gets you RAM AIR,,,, wow,,, go for it on the cheap
When The Flag Drops.,.